INCOME TAXES (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax liabilities:
Core deposit intangibles	$ (16,204)	$ (20,261)
Fixed assets	(19,260)	(20,716)
FHLB stock	(2,847)	(6,539)
Deferred loan fees	(1,530)	(2,041)
Purchased loan discounts	0	(66)
State taxes	(912)	(8,244)
Gain from FDIC-assisted acquisition	0	(2,127)
Acquired debt	(2,932)	(868)
Acquired loans and OREO	(9,342)	0
Other, net	(2,623)	(2,125)
Total gross deferred tax (liabilities)	(55,650)	(62,987)
Deferred tax assets:
Tax credit and other investments (1)	2,644	11,872
Allowance for loan losses and OREO reserves	132,221	118,773
NOL carryforwards	282	749
Deferred compensation	27,512	21,290
Mortgage servicing assets	1,118	3,305
Purchased loan premium	220	376
Unrealized loss on securities	5,964	55,375
FDIC receivable & clawback	0	48,366
Acquired loans and OREO	0	176,294
Nonaccrual interest income	5,268	458
Other, net	16,574	16,046
Total gross deferred tax assets (1)	191,803	452,904
Valuation allowance	(282)	(316)
Net deferred tax assets (1)	135,871	389,601
Federal
Deferred tax liabilities:
Core deposit intangibles	(12,588)	(15,748)
Fixed assets	(15,167)	(16,615)
FHLB stock	(2,229)	(5,064)
Deferred loan fees	(1,198)	(1,587)
Purchased loan discounts	0	(51)
State taxes	(912)	(8,244)
Gain from FDIC-assisted acquisition	0	(2,063)
Acquired debt	(2,295)	(2,237)
Acquired loans and OREO	(7,222)	0
Other, net	(1,740)	(1,652)
Total gross deferred tax (liabilities)	(43,351)	(53,261)
Deferred tax assets:
Tax credit and other investments (1)	(1,250)	5,523
Allowance for loan losses and OREO reserves	102,382	93,749
NOL carryforwards	0	0
Deferred compensation	21,484	16,505
Mortgage servicing assets	875	2,570
Purchased loan premium	172	292
Unrealized loss on securities	4,685	42,737
FDIC receivable & clawback	0	36,630
Acquired loans and OREO	0	139,360
Nonaccrual interest income	4,124	356
Other, net	12,905	11,833
Total gross deferred tax assets (1)	145,377	349,555
Valuation allowance	0	0
Net deferred tax assets (1)	102,026	296,294
State
Deferred tax liabilities:
Core deposit intangibles	(3,616)	(4,513)
Fixed assets	(4,093)	(4,101)
FHLB stock	(618)	(1,475)
Deferred loan fees	(332)	(454)
Purchased loan discounts	0	(15)
State taxes	0	0
Gain from FDIC-assisted acquisition	0	(64)
Acquired debt	(637)	1,369
Acquired loans and OREO	(1,714)	0
Other, net	(883)	(473)
Total gross deferred tax (liabilities)	(11,893)	(9,726)
Deferred tax assets:
Tax credit and other investments (1)	3,894	6,349
Allowance for loan losses and OREO reserves	28,686	23,615
NOL carryforwards	282	749
Deferred compensation	6,028	4,785
Mortgage servicing assets	243	735
Purchased loan premium	48	84
Unrealized loss on securities	1,279	12,638
FDIC receivable & clawback	0	11,736
Acquired loans and OREO	0	36,678
Nonaccrual interest income	1,144	102
Other, net	3,573	4,116
Total gross deferred tax assets (1)	45,177	101,587
Valuation allowance	(282)	(316)
Net deferred tax assets (1)	33,002	91,545
Foreign
Deferred tax liabilities:
Core deposit intangibles	0	0
Fixed assets	0	0
FHLB stock	0	0
Deferred loan fees	0	0
Purchased loan discounts	0	0
State taxes	0	0
Gain from FDIC-assisted acquisition	0	0
Acquired debt	0	0
Acquired loans and OREO	(406)	0
Other, net	0	0
Total gross deferred tax (liabilities)	(406)	0
Deferred tax assets:
Tax credit and other investments (1)	0	0
Allowance for loan losses and OREO reserves	1,153	1,409
NOL carryforwards	0	0
Deferred compensation	0	0
Mortgage servicing assets	0	0
Purchased loan premium	0	0
Unrealized loss on securities	0	0
FDIC receivable & clawback	0	0
Acquired loans and OREO	0	256
Nonaccrual interest income	0	0
Other, net	96	97
Total gross deferred tax assets (1)	1,249	1,762
Valuation allowance	0	0
Net deferred tax assets (1)	$ 843	$ 1,762